FIELD: communication engineering. SUBSTANCE: on sending end, system has double-type modulator built up of amplitude modulator 2, subcarrier oscillator 3, frequency modulator 4, carrier generator 5, transmitter 6; on transmitting side it, has receiver 7, amplitude detector 8, automatic gain control unit 9, carrier demodulator 10 built up of frequency detector 11, signal processing unit 12, signal detector 13. EFFECT: improved design. 8 cl, 2 dwg
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